Tartaric acid, H2C4H4O6, has two acidic hydrogens. The acid is often present in wines and precipitates from solution as the wine ages. A solution containing an unknown concentration of the acid is titrated with NaOH. It requires 25.65 mL of 0.1500 M NaOH solution to titrate both acidic protons in 60.00 mL of the tartaric acid solution.